Things may not be pollinating much yet, but with all moisture from snow, you could have mold. I know for us, mold is the biggest culprit for our respiratory issues. There's LOTS of mold in the produce department of grocery stores -- if difficult child 1 is having even mild asthma issues, all it takes for a full-blown attack is to have him walk into a grocery store.
Hopefully the pediatrician got her started on some pred to get things under control.